<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Popup</title>
    <script src="popup.js"></script>
    <style>
      *{
        margin: 0;
        padding: 0;
      }
       .popup{
        width: 300px;
        height: 300px;
        background-color: #f0f0f0;
       }
    </style>
  </head>
  <body>
     <div class="popup">
        <button id="extractBtn">启动</button>
        <button id="download">下载骨架屏</button>
        <input id="calss-valdue" type="text" value="skeleton" placeholder="请输入calss空格分割">
     </div>
     <script>
      console.log('popup.js');
     </script>
  </body>
</html>